1974 Chevy K5 Blazer - check Setup - Photo 15

Once Fenzel had the axle completed, he used an inch-pound torque wrench to check how much drag is in the setup. Once he was happy with it, the axle was filled with gear oil. When installing a new ring-and-pinion, it's best to drive it for 20 minutes, and then let it cool down completely to allow the gears to break in correctly and provide the longest, most reliable life. You should do this three times as well.